US3637217A  Puzzle with pieces in the form of subdivided rhombuses  Google Patents
Puzzle with pieces in the form of subdivided rhombuses Download PDFInfo
 Publication number
 US3637217A US3637217A US3637217DA US3637217A US 3637217 A US3637217 A US 3637217A US 3637217D A US3637217D A US 3637217DA US 3637217 A US3637217 A US 3637217A
 Authority
 US
 Grant status
 Grant
 Patent type
 Prior art keywords
 puzzle
 plurality
 group
 pieces
 puzzle pieces
 Prior art date
 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
 Expired  Lifetime
Links
Images
Classifications

 A—HUMAN NECESSITIES
 A63—SPORTS; GAMES; AMUSEMENTS
 A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
 A63F9/00—Games not otherwise provided for
 A63F9/06—Patience; Other games for selfamusement
 A63F9/12—Threedimensional jigsaw puzzles
Abstract
Description
Unite States Patent Kent [451 Jan. 25, 1972 [54] PUZZLE WITH PIECES IN THE FORM OF SUBDIVIDED RHOMBUSES [72] Inventor: Sherman Kent, 2824 Chain Bridge Road N.W., Washington, DC. 20016 [22] Filed: Feb. 13, 1970 [2]] Appl. No.: 11,143
[52] U.S. Cl. 273/157 R [51 Int. Cl. ..A63f 9/06 [58] Field of Search "273/156, 157 R; 35/27, 34, 35/72; 46/16, 17, 23
[56] I References Cited UNITED STATES PATENTS 143,835 10/1873 Muller 273/27 X 907,203 12/1908 Walker.. ..273/157 R 1,236,234 8/1917 Troje ...273/l57 R UX 3,178,332
4/1965 De La Rive Box ..273/l57 R X FOREIGN PATENTS OR APPLICATIONS 1,039,473 5/1953 France ..273/157 R 10,776 1891 Great Britain ..273/l57 R OTHER PUBLICATIONS Creative Playthings Catalog, received in Art Unit 334 1/28/69 page 42. relied on Primary ExaminerAnt0n O. Oechsle AttorneyMorton, Bernard, Brown, Roberts & Sutherland [57] ABSTRACT An educational puzzle made up of a plurality of blocks or puzzle pieces having the shapes of a rhomb us and forms generated by dividing the rhombus. Puzzles can be formed having, for example, a hexagonal shape utilizing various combinations of the pieces. A hexagonal container can hold a plurality of puzzles of varying complexity which can then be assembled within the container so that unless each puzzle is properly assembled, the last puzzle cannot be assembled.
20 Claims, 4 Drawing Figures PATENTED JAN251972 3,637121? m'mmm Q IO SHERMAN KENT ATTORNEYS PUZZLE Wll'llll PIECES IN THE FORM OF SUBDIVIDED RIIOMBUSES The present invention pertains to an educational toy. More particularly, the present invention pertains to a puzzle made up of a plurality of pieces having geometric shapes which when connected form a geometric pattern.
It is known that children are capable of learning many concepts at an early age. Mathematical relationships and geometric patterns can be taught to very young children, for example children of an age above about three years. Such teaching is greatly aided by the use of a teaching device of a type which maintains the childs interest while illustrating the concepts. Thus, if the teaching device takes the form of agame or toy, it retains the childs interest for a long period of time, while serving to teach the child numerous things. Geometric relationships can be taught to a young child even though the child is so young that he is incapable of expressing the relationships verbally. The present invention is a puzzle type of game by means of which geometric relationships can be taught. Even aside from the teaching of geometric relationships, the puzzle provides mental activity for the user which stimulates mental growth. 1
In accordance with the present invention, a puzzle iscor nprised of a plurality of pieces of a basic regular geometric shape such as a rhombus and of regular geometric shapes formed by subdividing the basic rhombus shape. Preferably, a container is provided having a shape corresponding to the regular geometric pattern of the finished puzzle and capable of holding a plurality of the finished puzzles which, for exam ple, might include puzzles made up of various ones of the several shapesformed by subdividing the basic rhombus so that the several puzzles constitute a set of puzzles of varying difficulty.
These and other aspects and advantages of the present invention are more apparent in the following description and claims, particularly when considered in conjunction with the accompanying drawings in which:
FIG. 1 depicts the basic rhombus shape and several of the regular geometric shapes formed by subdividing that basic rhombus shape;
FIGS. 2 and 3 are plan' views illustrating puzzles utilizing combinations of the regular geometric shapes of FIG. 1; and
ing block 36 on a line parallel to one of its sides, and constitutes a rhomboid onefourth the size of block 34 and thus oneeighth the size of block I0. Block 38 is a small isosceles triangle formed by cutting block 36 in the same manner as block 22 is formed from block I0. Block 38 therefore has an area oneeighth the area of block I0. Likewise, block 38 can be formed by cutting block 22 on a line connecting the midpoints of its equal sides. This cutting would divide block 22 into block 38 and block 40, and so block 40 has an area threeeighths the area of block 10. The blocks formed by subdividing block 10, as illustrated in FIG. 1, each have an area that is an integral multiple of oneeighth the area of block 10. These several blocks in FIG. I are illustrative of the many shapes which can be formed by dividing the basic rhombus shape of block 10. Blocks l and 36, blocks 22 and 38, blocks 24 and 30, and blocks 34 and 37 are all of similar shapes but different sizes. Numerous other blocks of smaller sizes and having shapes similar to shapes shown in FIG. 1 can likewise be formed, as well as blocks of other shapes and sizes. Every block formed for the puzzle. of the present invention preferably has corners forming angles which are integral multiples of 30. By way of example,the blocks might be made of wood or of a sturdy paperboard and might have a thickness in the order of threefourths inch.
FIG. 2 depicts a regular hexagonal geometric pattern puzzle shape 42 which can be formed by placing in juxtaposition pieces of the shapes depicted in FIG. 1. In its simplest form a regular hexagonal puzzle shape of the size of puzzle 42 could be made up of 12 rhombuses of the type depicted by block 10. Six of these rhombuses are placed with their 60 corners touching to form a hexagram, and the remaining six fill in the areas between adjacent points of that hexagram to give a hexagon. In FIG. 2, puzzle 42 illustrates the use of each of the blocks of FIG. I which are designated in FIG. 2 by reference numerals corresponding to those of FIG. 1. FIG. 3 likewise de FIG. 4 is a perspective view of a container for holding a plurality of puzzles in accordance with the present invention.
Block l0in FIG. I depicts the basic rhombus shape utilized to form the puzzle of the present invention. Preferably, block has corners l2 and 14 of 60 and corners l8 and of 120. Other regular geometric shapes are formed by subdividing the basic rhombus shape depicted by block 10. Thus, for example, block 22 is formed by subdividing block I0 on a line connecting comers 12 and 14, and block 22 forms an isosceles triangle. The corners of block 22 are 30 and 120. Similarly, block 24 is fomted by cutting block 10 on a line connecting corners l8 and 20, and thus block 24 comprises an equilateral triangle. Block 26 is formed by bisecting block 24' and thus constitutes a 30f60 righttriangle. Block 28 is a regular hexagon formed by cutting block 10 on a line connecting the midpoints of side 1248 and side 1220 and on a line connecting the midpoints of side 1418 and side 1420. Block 30 then depicts one of the portions removed from one side of block 10 to form block 28 and constitutes a small equilateral triangle with an area oneeighth that of block 10. Block 28 therefore has an area threefourths that of block 10. Block 32 is formed by bisecting block 28 and constitutes a trapezoid with an area threeeighths that of block 10. Thus, if blocks 30 and 32 are placed together they form an equilateral triangle the same size as block 24.
Block 34 is formed by bisecting block 10 on a line parallel to one of its sides, and constitutes a rhomboid. Blocks 22, 24 and, 34 thus each have an area equal to onehalf the area of the rhombus of block 10, while block 26 has an area onefourth the area of block 10. Block 36 is formed by bisecting block 34 and constitutes a rhombus having'an area equal to onefourth the area of block 10. Block 37 is formed by bisectpicts a puzzle 44 having a regular hexagonal pattern and formed by juxtapositioning selected ones of the puzzle pieces of FIG. 1. The resulting pattern and the puzzles appeal to users are enhanced by coloring various ones of the blocks with different bright colors.
FIG. 4 depicts a container 46 having a regular hexagonal cross section and suitable for holding several puzzles of the type depicted in FIGS. 2 and 3. Container 46 is likewise made of a sturdy material such as wood or cardboard with a thickness in the order of onefourth inch and includes a removable top 48. Container 46 can be provided with a set of puzzles of varying difficulty. Thus, for example, container 46 might be provided with six puzzles, the first of these puzzles might include only rhombuses of the type depicted by block 10 and thus would be completed with 12 such puzzle pieces. The remaining puzzles might include a first group of puzzle pieces of the rhombus shape depicted by block 10 and a second group of puzzle pieces of the regular geometric shapes formed by subdividing rhombus 10, as depicted in FIG. 1. In one of these remaining puzzles this second group of puzzle pieces might be composed of the larger triangles, depicted by blocks 22 and 24, and the rhomboid of block 34. Another puzzle might add to this second group of puzzle pieces the smaller rhombuses 36 and, for example, could be a puzzle 44 as depicted in FIG. 3. The remaining puzzles can include as a portion of this second group of puzzle pieces additional ones of the blocks of FIG. 1 or other blocks and thus can be of increasing complexity. By increasing the number of different shape and size blocks in each puzzle, the difficulty of the puzzle and the challenge to the user are increased. Thus, the first puzzle would provide entertainment and educational benefit for a very young child, while the later puzzles do the same for older users, as well as providing a relaxing pastime activity. If the set of puzzles provided in container 46 includes only enough puzzle pieces to complete the full set, then a person putting together the puzzles within container 46 would be required to properly complete each puzzle in order to be able to finish all six puzzles within the container. The degree of difficulty can be varied by making each piece the same color or by having pieces of different colors to provide a code by means of which a solution to the puzzles can be indicated. It will be observed that each puzzle is readily completed if, before placing pieces into container 46 as a part of the puzzle, the pieces are first laid out in the shape of a rhombus, for example, as formed by blocks 22, 38, and 40 in puzzle 42 of FIG. 2.
It can thus be seen that the puzzle of the present invention provides educational activity for the very young and a relaxing pastime for older persons, utilizing as a basic shape the rhombus as depicted by block and further utilizing shapes formed by subdividing that rhombus shape into shapes such as those depicted in FIG. 1. Numerous other shapes can, of course, be generated by subdividing the several blocks of FIG, 1. Other alterations and rearrangements might likewise be made and yet the results would be within the scope of the invention.
What is claimed is:
l. A puzzle comprising a plurality of puzzle pieces capable when placed in juxtaposition of forming a puzzle shape of a regular hexagon, each of a first group of said plurality of puzzle pieces being a rhombus and being of the same area and each of a second group of said puzzle pieces being a regular geometric shape formed by subdividing a rhombus, and being of onehalf the area of a piece in said first group of puzzle pieces, said second group of puzzle pieces including equilateral triangles, isosceles triangles, and rhomboids.
2. A puzzle comprising a plurality of puzzle pieces capable when placed in juxtaposition of forming a puzzle shape of a regular hexagon, each of a first group of said plurality of puzzle pieces being a rhombus and each of a second group of said puzzle pieces being a regular geometric shape formed by subdividing a rhombus, said second group of puzzle pieces including equilateral triangles, isosceles triangles, and rhomboids with said equilateral triangles being of at least two different sizes.
3. A puzzle as claimed in claim 2 in which a portion of said second group of puzzle pieces are right triangles.
4. A puzzle as claimed in claim 3 in which a portion of said second group of puzzie pieces are regular hexagons.
5. A puzzle as claimed in claim 4 in which a portion of said second group of puzzle pieces are trapezoids.
6. A puzzle as claimed in claim 5 in which the corners of each puzzle piece define angles which are integral multiples of 30.
7. A puzzle set comprising:
a box having a cross section of a regular hexagon;
a plurality of puzzles, each puzzle including a plurality of puzzle pieces capable when placed in juxtaposition of forming a puzzle shape of the regular hexagon of said box, each of a first group of said plurality of puzzle pieces of at least some of said plurality of puzzles being a rhombus and being of the same area and each of a second group of said plurality of puzzle pieces of at least some of said puzzles being formed by subdividing a rhombus and having an area equal to onehalf the area of pieces of said first group of puzzle pieces, said second group of puzzle pieces including equilateral triangles, isosceles triangles, and rhomboids.
8. A puzzle set comprising:
a box having a cross section of a regular hexagon;
a plurality of puzzles, each puzzle including a plurality of puzzle pieces capable when placed in juxtaposition of forming a puzzle shape of the regular hexagon of said box, each of a first group of said plurality of puzzle pieces of at least some of said plurality of puzzles being a rhombus, and a second group of said plurality of puzzle pieces of at least some of said puzzles including equilateral triangles, isosceles triangles, rhomboids, right triangles, regular hexagons and trapezoids formed by subdividing a rhombus.
9. A puzzle comprising a plurality of puzzle pieces capable when placed in juxtaposition of forming a puzzle shape of a regular geometric pattern, each of a first group of said plurality of puzzle pieces being a rhombus and being of the same area and each of a second group of said puzzle pieces being a regular geometric shape formed by subdividing a rhombus and having an area equal to an integral multiple of oneeighth the area of a piece in the first group of puzzle pieces, said second group of puzzle pieces including equilateral triangles, isosceles triangles, and rhomboids.
10. A puzzle as claimed in claim 9 in which each puzzle piece of said second group of puzzle pieces has an area onehalf the area of a piece in the first group of puzzle pieces.
11. A puzzle comprising a plurality of puzzle pieces capable when placed in juxtaposition of forming a puzzle shape of a regular geometric pattern, each of a first group of said plurality of puzzle pieces being a rhombus and each of a second group of said puzzle pieces being a regular geometric shape formed by subdividing a rhombus, said second group of puzzle pieces including equilateral triangles, isosceles triangles, and rhomboids with said equilateral triangles being of at least two different sizes.
12. A puzzle set comprising:
a box having a cross section of a regular geometric pattern;
a plurality of puzzles, each puzzle including a plurality of puzzle pieces capable when placed in juxtaposition of forming a puzzle shape of the regular geometric pattern of said box, each of a first group of said plurality of puzzle pieces of at least some of said plurality of puzzles being a rhombus and being of the same area and each of a second group of said plurality of puzzle pieces of at least some of said puzzles having an area equal to an integral multiple of oneeighth the area of a piece in the first group of puzzle pieces, said second group of puzzle pieces including equilateral triangles, isosceles triangles, and rhomboids formed by subdividing a rhombus.
13. A puzzle as claimed in claim 12 in which each puzzle piece of said second group of puzzle pieces has an area onehalf the area of a piece in the first group of puzzle pieces.
14. A puzzle set comprising:
a box having a cross section of a regular geometric pattern;
a plurality of puzzles, each puzzle including a plurality of puzzle pieces capable when placed in juxtaposition of forming a puzzle shape of the regular geometric pattern of said box, said plurality of puzzle pieces of at least some of said plurality of puzzles including a first group with the pieces therein being rhombuses, and said plurality of puzzle pieces of at least some of said puzzles including a second group with the pieces therein being equilateral triangles, isosceles triangles, rhomboids, right triangles, regular hexagons and trapezoids formed by subdividing rhombuses.
15. A puzzle comprising a plurality of puzzle piece groups capable when placed in juxtaposition of forming a puzzle shape of a regular geometric pattern, each of said plurality puzzle piece groups having the shape of a rhombus, all of said plurality of puzzle piece groups being of the same area, at least some of said plurality of puzzle piece groups including a plurality of puzzle pieces, each of said plurality of puzzle pieces having an area equal to an integral multiple of oneeighth the area of one of said puzzle piece groups, said plurality of puzzle pieces including geometric shapes fonned by subdividing a rhombus of an area equal to the area of one of said plurality of puzzle piece groups.
16. A puzzle as claimed in claim 15 in which the regular geometric pattern is a hexagon.
17. A puzzle as claimed in claim 15 in which said plurality of puzzle pieces includes equilateral triangles, isosceles triangles and rhomboids.
18. A puzzle as claimed in claim 15 in which each of said puzzle pieces has an area onehalf the area of one of said puzzle piece groups.
19. A puzzle comprising a plurality of puzzle pieces capable when placed in juxtaposition of forming a puzzle shape of a regular geometric pattern, each of a first group of said plurality of puzzle pieces being a rhombus and each of a second group of said plurality of puzzle pieces being a regular geometric shape formed by subdividing a rhombus, said second group of said plurality of puzzle pieces including equilateral triangles, isosceles triangles, rhomboids, right triangles, regular hexagons, and trapezoids formed by subdividing a rhombus.
20. A puzzle comprising a plurality of puzzle piece groups capable when placed in juxtaposition of forming a puzzle
Claims (20)
Priority Applications (1)
Application Number  Priority Date  Filing Date  Title 

US1114370 true  19700213  19700213 
Publications (1)
Publication Number  Publication Date 

US3637217A true US3637217A (en)  19720125 
Family
ID=21749065
Family Applications (1)
Application Number  Title  Priority Date  Filing Date 

US3637217A Expired  Lifetime US3637217A (en)  19700213  19700213  Puzzle with pieces in the form of subdivided rhombuses 
Country Status (1)
Country  Link 

US (1)  US3637217A (en) 
Cited By (27)
Publication number  Priority date  Publication date  Assignee  Title 

US4177993A (en) *  19770829  19791211  Crosby Bruce R  Variable block puzzle and container 
US4223890A (en) *  19790430  19800923  Schoen Alan H  Set of tiles for covering a surface 
US4259804A (en) *  19800331  19810407  Samuels Stephen S  Physiognomically based puzzle toy 
WO1981002843A1 (en) *  19800331  19811015  S Samuels  Physiognomically based puzzle toy 
US4561097A (en) *  19841009  19851224  Florence Siegel  Puzzle formed of geometric pieces having an even number of equilateral sides 
US4723382A (en) *  19860815  19880209  Haresh Lalvani  Building structures based on polygonal members and icosahedral 
WO1988005680A1 (en) *  19870205  19880811  Hidvegi Valeria  Toy set of elements for forming patterns or pictures 
US4773649A (en) *  19870512  19880927  TienTsai Huang  Pieces assembable to form regular hexagons and other figures 
US4799680A (en) *  19871118  19890124  Weimar Deborah M  Transparent puzzle 
US4913436A (en) *  19881125  19900403  Li Shuo Yen R  Puzzles and game based on geometric shapes 
US5314183A (en) *  19930317  19940524  Schoen Alan H  Set of tiles for covering a surface 
US5407201A (en) *  19930323  19950418  Whitehurst; Timothy D.  Educational puzzle and method of construction 
US5992851A (en) *  19981013  19991130  Ajtai; Miklos  Towers of hanoi game 
US6145837A (en) *  19980828  20001114  A. Daigger And Company, Inc.  Threedimensional geometric puzzle 
US20060151947A1 (en) *  20050110  20060713  Scott Fredrickson  Jigsaw puzzle game system 
US20070262521A1 (en) *  20060512  20071115  Williams Sonoma, Inc.  Learning puzzle of geometric shapes 
US20080116637A1 (en) *  20061120  20080522  Seals Calvin L  Rhombus twelve manipulation game 
WO2009156772A1 (en) *  20080625  20091230  Dimitrios Mantikas  Structural element 
WO2012085592A1 (en) *  20101224  20120628  Hexcel Designs Limited  Geometrical shape apparatus 
US20120306153A1 (en) *  20100201  20121206  Mordechai Lando  Cube puzzle 
US20130320620A1 (en) *  20120604  20131205  Amanda SHIELDS  Shape only 
US20140357151A1 (en) *  20130603  20141204  Ronald A. Worley  Geometric Building Block Assembly 
US20150194061A1 (en) *  20121017  20150709  Pascal Co., Ltd.  Figure plate set 
US20150255003A1 (en) *  20121228  20150910  Pascal Co., Ltd.  Figure plate set 
US9238180B2 (en)  20131016  20160119  Feltro Inc.  Modular construction panel 
USD748202S1 (en) *  20131016  20160126  Feltro Inc.  Modular construction panel 
US20160284237A1 (en) *  20150323  20160929  Dongsik CHA  Twelvepiece tangram puzzle set 
Citations (5)
Publication number  Priority date  Publication date  Assignee  Title 

US143835A (en) *  18731021  Improvement in toy blocks for objectteaching  
US907203A (en) *  19070920  19081222  Willis Walker  Puzzle. 
US1236234A (en) *  19170330  19170807  Oscar R Troje  Toy buildingblock. 
FR1039473A (en) *  19510709  19531007  tile games, dominoes and jigsaw with the possibility of multiple combinations  
US3178332A (en) *  19600127  19650413  Box Robbert De La Rive  Mosaic comprising a plurality of permanently detachable mosaic elements 
Patent Citations (5)
Publication number  Priority date  Publication date  Assignee  Title 

US143835A (en) *  18731021  Improvement in toy blocks for objectteaching  
US907203A (en) *  19070920  19081222  Willis Walker  Puzzle. 
US1236234A (en) *  19170330  19170807  Oscar R Troje  Toy buildingblock. 
FR1039473A (en) *  19510709  19531007  tile games, dominoes and jigsaw with the possibility of multiple combinations  
US3178332A (en) *  19600127  19650413  Box Robbert De La Rive  Mosaic comprising a plurality of permanently detachable mosaic elements 
NonPatent Citations (1)
Title 

Creative Playthings Catalog, received in Art Unit 334 1/28/69 page 42. relied on * 
Cited By (35)
Publication number  Priority date  Publication date  Assignee  Title 

US4177993A (en) *  19770829  19791211  Crosby Bruce R  Variable block puzzle and container 
US4223890A (en) *  19790430  19800923  Schoen Alan H  Set of tiles for covering a surface 
US4259804A (en) *  19800331  19810407  Samuels Stephen S  Physiognomically based puzzle toy 
WO1981002843A1 (en) *  19800331  19811015  S Samuels  Physiognomically based puzzle toy 
US4385467A (en) *  19800331  19830531  Samuels Stephen S  Physiognomically based puzzle toy 
US4561097A (en) *  19841009  19851224  Florence Siegel  Puzzle formed of geometric pieces having an even number of equilateral sides 
US4723382A (en) *  19860815  19880209  Haresh Lalvani  Building structures based on polygonal members and icosahedral 
WO1988005680A1 (en) *  19870205  19880811  Hidvegi Valeria  Toy set of elements for forming patterns or pictures 
US4773649A (en) *  19870512  19880927  TienTsai Huang  Pieces assembable to form regular hexagons and other figures 
US4799680A (en) *  19871118  19890124  Weimar Deborah M  Transparent puzzle 
US4913436A (en) *  19881125  19900403  Li Shuo Yen R  Puzzles and game based on geometric shapes 
US5314183A (en) *  19930317  19940524  Schoen Alan H  Set of tiles for covering a surface 
WO1994021341A1 (en) *  19930317  19940929  Schoen Alan H  Set of tiles for covering a surface 
US5407201A (en) *  19930323  19950418  Whitehurst; Timothy D.  Educational puzzle and method of construction 
US6145837A (en) *  19980828  20001114  A. Daigger And Company, Inc.  Threedimensional geometric puzzle 
US5992851A (en) *  19981013  19991130  Ajtai; Miklos  Towers of hanoi game 
US20060151947A1 (en) *  20050110  20060713  Scott Fredrickson  Jigsaw puzzle game system 
US20070262521A1 (en) *  20060512  20071115  Williams Sonoma, Inc.  Learning puzzle of geometric shapes 
US20080116637A1 (en) *  20061120  20080522  Seals Calvin L  Rhombus twelve manipulation game 
WO2009156772A1 (en) *  20080625  20091230  Dimitrios Mantikas  Structural element 
US20120306153A1 (en) *  20100201  20121206  Mordechai Lando  Cube puzzle 
US9162139B2 (en) *  20100201  20151020  Mordechai Lando  Cube puzzle 
US9795869B2 (en) *  20101224  20171024  Hexcel Designs Limited  Geometrical shape apparatus 
US20130295548A1 (en) *  20101224  20131107  Stephen William Cruwys Brazier  Geometrical shape apparatus 
WO2012085592A1 (en) *  20101224  20120628  Hexcel Designs Limited  Geometrical shape apparatus 
US20130320620A1 (en) *  20120604  20131205  Amanda SHIELDS  Shape only 
US20150194061A1 (en) *  20121017  20150709  Pascal Co., Ltd.  Figure plate set 
US9443440B2 (en) *  20121017  20160913  Pascal Co., Ltd.  Figure plate set 
US9443444B2 (en) *  20121228  20160913  Pascal Co., Ltd.  Figure plate set 
US20150255003A1 (en) *  20121228  20150910  Pascal Co., Ltd.  Figure plate set 
US20140357151A1 (en) *  20130603  20141204  Ronald A. Worley  Geometric Building Block Assembly 
USD748202S1 (en) *  20131016  20160126  Feltro Inc.  Modular construction panel 
US9238180B2 (en)  20131016  20160119  Feltro Inc.  Modular construction panel 
US20160284237A1 (en) *  20150323  20160929  Dongsik CHA  Twelvepiece tangram puzzle set 
US10078972B2 (en) *  20150323  20180918  Dongsik CHA  Twelvepiece tangram puzzle set 
Similar Documents
Publication  Publication Date  Title 

US3235263A (en)  Hollow toy block  
US3433485A (en)  Puzzle  
Jones et al.  The play's the thing: Teachers' roles in children's play  
US3577672A (en)  Modular rigid blocktype dollhouse construction toy  
US3472514A (en)  Word forming game apparatus comprising matching hexagonal board areas and playing pieces  
US5947786A (en)  Educational blocks with enhanced manipulation features  
Stinson  Dance for Young Children. Finding the Magic in Movement.  
US5183430A (en)  Geometric toy construction system  
US3612537A (en)  Assembling toy  
US3633587A (en)  Infant{40 s toy  
US3381394A (en)  Educational device  
US1531542A (en)  Toy block  
Arnheim  A plea for visual thinking  
US2984488A (en)  Artistic game apparatus  
US5393063A (en)  Cube puzzle  
US5076793A (en)  Fractal mathematics kit  
US4295832A (en)  Educational toy  
US3717942A (en)  Rotatable amusement and education device  
US4838794A (en)  Metric block toy  
US3662486A (en)  Polyhedral amusement and educational device  
US8061713B2 (en)  Three dimensional geometric puzzle  
US4547160A (en)  Educational building toy  
US2899757A (en)  Addup block toy for teaching arithmetic  
US3964749A (en)  Pentomino puzzles  
US4183167A (en)  Three dimensional toy 